Ross W. Greene, Ph.D., is an internationally prominent psychologist and originator of the Collaborative Problem Solving approach (now known as Collaborative & Proactive Solutions), described in his influential books, "The Explosive Child" (updated 5th edition) and "Lost at School" (revised 2nd edition). Dr. Greene was on the teaching faculty at Harvard Medical School for over 20 years until 2014. He currently is adjunct associate professor in the Department of Psychology at Virginia Tech. He is also the Founding Director of the nonprofit “Lives in the Balance,” which provides a vast array of free, web-based resources on the CPS model and advocates on behalf of behaviorally challenging kids and their parents, teachers, and other caregivers. He is the recipient of numerous grants and provides consultation to schools, treatment centers, juvenile facilities, and related organizations. He also lectures widely throughout the world, currently living in Portland, Maine, with his wife and two kids.